[issue1286] fileinput, StringIO, and cStringIO do not support the with protocol

[Yitz Gale]

Yitz Gale added the comment:

I was actually bitten badly by this issue with
StringIO. I added fileinput only as an afterthought.

In an xml.sax app, I needed seek() support for a
codec-wrapped file handle, so I over-wrapped it with
StringIO. The result was that I had to refactor code all over
the place to handle StringIO as a special case. What a
mess!

Why is this getting over-excited? It's a very
lightweight change. You can't beat the cost/benefit ratio.

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